MLB.com(HOUSTON) -- While the Houston Astros and Los Angeles Dodgers will both be trying to take a step towards winning the World Series tonight, one 7-year-old girl already realized a dream.

Hailey Dawson, who has a 3-D printed prosthetic hand, tossed out the ceremonial first pitch Saturday night at Minute Maid Park in Houston. It's Hailey’s dream to pitch at all 30 major league stadiums and eventually break the world record for the most first pitches thrown at separate, major league ballparks, her mother, Yong Dawson, said.

"She inspires people all the time," Yong Dawson said. "And what she tells me is, 'I'm just being Hailey.'"

The Henderson, Nevada, girl has Poland syndrome, a rare birth defect that caused her to be born without three fingers on her right hand. She uses a special 3-D printed hand that was developed by engineers at the University of Nevada, Las Vegas.

Just like she would with a pair of shoes, as Hailey grows, she will outgrow her prosthetic hand. She'll go through a handful more in her lifetime, but this one is special. This is the hand throwing out the first pitch at the World Series.

This hand has also garnered quite a few autographs. Second only to pitching on a major league mound, Hailey likes getting signatures on her hand, her mom said.

This was Hailey's most-watched pitch yet, but she says she wasn't nervous. When asked what it's like to throw the first pitch on such a large stage, she replied with only one word: "Exciting."

Hailey threw the first pitch for a minor league team in Las Vegas in 2015. She threw the first pitch that year at Baltimore’s Camden Yards for her favorite team, the Orioles. She also threw the first pitch this year for the Washington Nationals at Nationals Park in Washington, D.C.

The pitch will do more than help Hailey achieve a goal, her mother says. Major League Baseball is working hand in glove with Hailey to bring awareness to Poland syndrome and help people realize how easily accessible robotic hands are.

And as for who she likes in the World Series, Hailey says Astros all the way.